Improvement in lifting-jacks



A. J. LANDIS. Lifting-Jacks.

No. 20m-4o. Patented Feb. 12, |878.

MPETERS. PHOTO-LITHOGRAPHE. WASHINGTD. D. CA

UNITED STATES PATENT OEEIGE.

AMOS J. LANDIS, OF COLUMBIA CITY, INDIANA.

IMPROVEMENT IN LI.FTINGJACKS.

Specification forming part of Letters Patent No. 200,140, dated February12, 1878; application filed May 19, 1877.

construction and operation, as well as cheaply made, occupying littlespace, easily handled,

self-locking, durable, and in all respects effi cient and practical forthe purposes and uses for which it is intended. Its principal use is forlifting the axles and wheels of carriages, wagons, and other vehiclesfor lubricating or other purposes; and it is also useful for raisingother objects that require to be lifted and held in certain positionsfor a given period of time o r for any special purpose.

The nature and practical operation of my invention are more fully setforth in the following description, reference being had to theaccompanying drawings, which are made a part of this specification.

The base, which supports the working parts of the lifting-jack and theweight lifted by it, is shown at A.

At B is shown a perpendicular standard, having its lower end mortisedinto or otherwise firmly affixed to base A, and also having the guides Fsecurely attached to its edges, as shown at g. These guides are soshaped and attached as to permit a free upward and downward movement ofthe elevating-block D- between them, this elevating-block being also somade and shaped as to permit of such free movement, substantially asrepresented. The top of elevating block D is shaped, as shown, intosuccessive steps or notches, one above the other, whereby thelifting-jack is adapted to be placed imder axles or other objects ofdifferent heights.

At DZ is represented a notch cut in the edge or side of block D. At M ispivoted to D the short end of lever K, which at L is also pivoted to theupper end of the movable fulcrum H, the lower end of which is pivoted orhinged to base A, as shown in the drawings.

Operation: When it is desired to lift 'any object with thislifting-jack, the long end of lever K is raised up, bringing the block Ddown to base A, and the upper end of fulcrum H into the position shownin the drawing. Then the lifting-jack is placed with its base on thefloor, ground, or other foundation, and with one of its steps, 1, 2, 3,or 4, under the axle or other object to be lifted. Then the long end oflever K is pressed downward, thus elevating the block D and the axle orother weight. The downward pressure on lever K is continued until thelever K, fulcrum H, and block D assiune the positions indicated by thedotted lines.

It will be observed that this downward movement of the long end of leverK brings the upper end of movable fulcrum H into the notch D2 in blockD, thus locking the lift ing-jack, and holding up the weight as long asmay be desired. The points of pivoting at L and M, the position andshape of the notch D2, the weight and length of the handle of lever K,and the length, inclination, and shape of fulcrum H, are all soadjusted, with reference to each other, that when the lever-handle isdepressed, as before stated, the lifting-jack is locked, as beforestated, and yet this locking is effected in such a manner that theweight lifted can be let down at pleasure by a slight upward pull on thehandle of the lever K.

I construct my improved lifting -jack of wood, iron, or other material,according to the use or service to which it is to be applied.

I claim- The base A, standard B, guides F, elevatingblock D, notch D2,lever K, and movable fulcrum H, all combined and operated together forlifting weights and holding or locking them in position when raised,substantially as described and illustrated.

AMOS J. LANDIS.

Witnesses: I

WILLIAM MIEsER, EUGENE STOUGE.

